\begin{tikzpicture}
    \tkzDefPoints{0/0/B, 3.6/0/C}
    \tkzInterCC[R](B,2.8)(C,3.5)  \tkzGetFirstPoint{A}
    \tkzDefPointOnLine[pos=4/9](B,C)  \tkzGetPoint{D}

    \tkzDrawPolygon(A,B,C)
    \tkzDrawSegment(A,D)
    \tkzLabelPoints[above](A)
    \tkzLabelPoints[left](B)
    \tkzLabelPoints[right](C)
    \tkzLabelPoints[below](D)
\end{tikzpicture}

